← All yakuKokushi Musou (国士無双)13 hanThirteen orphans — one of each terminal and honor, plus a pair.Example winning handWinning tile: 1z▶ Try this hand in the calculatorOpen Riichi calculator →Other 13-han yakuSuuankou (四暗刻)13 hanDaisangen (大三元)13 hanShousuushii (小四喜)13 hanDaisuushii (大四喜)13 han